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neurology neurosurgery brain stroke vp shunt csf anatomy spine physiology autoregulation cerebral blood flow brain tumour hydrocephalus nph brainstem etv markers genetics c2 fracture axis fracture dens cervical fracture icp intracranial pressure one and half syndrome pons midbrain brachial plexus injury injury brachial plexus blood supply of brain ct head traumatic brain injury head injury dsa sah aneurysm ischemia slit ventricle surface anatomy third ventricle thoracic lumbar spine vein of galen malformation vein of galen embolization shunt venous drainage who classification mutation update blood brain barrier ventricle csf dynamics cv junction craniovertebral junction ligaments embryology cns brain embryology spine embryology evd iv disc disc anatomy intervertebral disc normal pressure hydrocephalus csf disorder posterior circulation barrier